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    需求1
    div,span,p标签的演示
    div标签   默认独占一行
    span标签  他的长度是封装数据的长度
    p段落标签   默认会在段落的上方或者下方各空出一行来(如果已有就不再空)
</div>

<div>div标签1</div>
<div>div标签2</div>
<span>span标签1</span>
<span>span标签2</span>
<p>p段落标签1</p>
<p>p段落标签2</p>

<div class="look_source_code" onclick="getPageContent()">查看源码</div>
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